ive got a '98 156 2.0TS and its got its service coming up and i know the air filter needs a change as its knackered!!
is it worth sticking with an OE filter or an aftermarket one. what will the diferences be between the 2... apart from a better induction note, and what is the likley difference in cost?

I've just changed my stock one. I used a BMC Sports Filter from EB Spares (about £40 all in) and also changed the stock air intake over to a GTA intake (about £20 all in). I did them about a week apart from each other. The change in Air Filter seemed to give more low end torque and I also noticed an increase in mpg. The new intake pipe gave better throttle response and a better growl to the engine note.

As a side note I'm now trying to find a way to get more air into the area where the intake pipe feeds from. Has anyone tried anything similar?